import random
a = [0,1, 2, 3, 4, 5, 6, 7, 8, 9]
b = []
c = []
for i in range(2):
    k = random.randint(97,122)
    k = [chr(k)]
    b = b + k
for i in range(2):
    k = random.randint(65, 90)
    k = [chr(k)]
    c = c + b
